Active plasma antenna in the Earth's ionosphere

Chugunov, Yu. V.; Марков, Г. А.

doi:10.1016/s1364-6826(01)00055-4

Cited by 35 publications

(24 citation statements)

References 14 publications

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“…(27) is shown by the solid blue line, while the dashed red line represents the distribution w(x) ¼ w mod (x) corresponding to Eq. (34). It is seen in the figures that the results yielded by the two methods are qualitatively similar for a short current pulse with n ¼ 1, become rather close for a longer pulse with n ¼ 2, and coincide with graphical accuracy for a pulse with n ¼ 10.…”

supporting

confidence: 60%

“…We assumed that the antenna radius b ¼ 2.5 m, the duct radius a ¼ 5 m, and the plasma densityÑ inside the duct (normalized to N a ) varies in the range 10 <Ñ=N a < 30. The possibility to ensure such duct parameters is confirmed by the results of some active experiments on the additional ionization of the background ionospheric plasma in a strong field of the antenna onboard spacecraft, 34 as well as by the theoretical study 36 of the ionization formation of a field-aligned plasma density irregularity in the near-zone field of a loop antenna.…”

mentioning

confidence: 83%

“…To solve the formulated problem, we will use a rigorous fullwave approach throughout the article and apply this analysis to the case where the frequency spectrum of the antenna current is concentrated in the whistler range. Such an analysis is topical in view of the fact that corresponding conditions are typical of many modeling laboratory 13,17 and active ionospheric 34 experiments. Moreover, determination of the radiation characteristics of a pulsed loop antenna in the presence of an enhanced-density duct seems crucial to understanding the influence of such a duct on the antenna radiation characteristics as compared to the case of monochromatic excitation.…”

Section: Introductionmentioning

confidence: 99%

“…This quantity was calculated using the exact formula (27) and the approximate approach based on Eq. (34). As an example, Figs.…”

mentioning

confidence: 99%

“…In the figure, the open circles indicate the total energy radiated from a source with time dependence (6) for various values of n ¼ sx 0 /p. The asterisks indicate the calculation results obtained using the approximate formula (34). The open squares show the energy radiated from the source having time dependence (7) with t 0 ¼ p/2x 0 for the same values of x 0 and other parameters.…”

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confidence: 99%

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Whistler wave radiation from a pulsed loop antenna located in a cylindrical duct with enhanced plasma density

Kudrin¹,

Shkokova²,

Ferencz

et al. 2014

Physics of Plasmas

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Pulsed radiation from a loop antenna located in a cylindrical duct with enhanced plasma density is studied. The radiated energy and its distribution over the spatial and frequency spectra of the excited waves are derived and analyzed as functions of the antenna and duct parameters. Numerical results referring to the case where the frequency spectrum of the antenna current is concentrated in the whistler range are reported. It is shown that under ionospheric conditions, the presence of an artificial duct with enhanced density can lead to a significant increase in the energy radiated from a pulsed loop antenna compared with the case where the same source is immersed in the surrounding uniform magnetoplasma. The results obtained can be useful in planning active ionospheric experiments with pulsed electromagnetic sources operated in the presence of artificial field-aligned plasma density irregularities that are capable of guiding whistler waves.

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supporting

confidence: 60%

mentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

“…This quantity was calculated using the exact formula (27) and the approximate approach based on Eq. (34). As an example, Figs.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Whistler wave radiation from a pulsed loop antenna located in a cylindrical duct with enhanced plasma density

Kudrin¹,

Shkokova²,

Ferencz

et al. 2014

Physics of Plasmas

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Whistler Wave Emission from a Modulated Electron Beam in a Collisional Magnetoplasma in the Presence of a Density Duct

Zaboronkova

Krafft

Kudrin

et al. 2005

Radiophys Quantum Electron

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UDC 533.951We study the radiation from a modulated electron beam injected along the axis of a cylindrical density duct in a magnetoplasma. An expression for the average power lost by the beam at the modulation frequency is obtained and analyzed. It is shown that in the case ofČerenkov resonance of the beam with a weakly damped whistler mode of an enhanced-density duct, a noticeable increase in this power is possible compared with the case where the beam is injected in a homogeneous background magnetoplasma. Based on the results of numerical calculations performed for conditions of the Earth's ionosphere, we give estimates of an increase in the power radiated from the beam in the whistler frequency range in the presence of a cylindrical duct with enhanced density.

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Dispersion properties and field structures of eigenmodes of nonuniform plasma waveguides in a longitudinal magnetic field

Vdovichenko

Марков

2006

Radiophys Quantum Electron

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We study the field structure and dispersion properties of a hybrid eigenmode guided by a nonuniform magnetized plasma waveguide. It is shown that the rotational and quasi-potential waves contribute to the formation of such a mode in the whistler frequency range. Depending on the plasma density, the rotational component of the hybrid mode is determined by either waves with complex transverse wave numbers or whistler waves, or by true surface waves. In the presence of an axial nonuniformity of the plasma in a channel, the transverse field structure of the propagating mode changes, which is stipulated by changes in both the values of transverse wave numbers and their dependence on the radial coordinate. It is found that the spectrum of axial wave numbers of eigenmodes of a plasma waveguide undergoes a pronounced condensation when smoothing the waveguide walls. The damping of the hybrid mode of a nonuniform waveguide due to electron collisions is found and it is shown that collisional losses determine the damping of waves trapped in the waveguide in the experiments on ionization self-channeling of whistler waves. We have found the effect of "displacing" the strong field from the inner core to the background outer region of the waveguide with increasing plasma density on its axis and broadening background region.

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Active plasma antenna in the Earth's ionosphere

Cited by 35 publications

References 14 publications

Whistler wave radiation from a pulsed loop antenna located in a cylindrical duct with enhanced plasma density

Whistler wave radiation from a pulsed loop antenna located in a cylindrical duct with enhanced plasma density

Whistler Wave Emission from a Modulated Electron Beam in a Collisional Magnetoplasma in the Presence of a Density Duct

Dispersion properties and field structures of eigenmodes of nonuniform plasma waveguides in a longitudinal magnetic field

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